Google Drive API doesn't play well with ProGuard (NPE)

Question

Currently, I\'m having experience that, a piece of code, which makes use of Google Drive API is running fine without introducing ProGuard.

However,

Answer 1

Proper combination is :

-keepattributes Signature,RuntimeVisibleAnnotations,AnnotationDefault

There's proguard configuration prepared by Google for project google-api-java-client

https://github.com/google/google-api-java-client/blob/57fe35766cbba0a0d5a9a296be81468d730a29f8/google-api-client-assembly/proguard-google-api-client.txt